Data/hora: 16/06/2024 09:43:24

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 16/02/1996
Data da última atualização: | 16/02/1996
Autoria: | ANDREW, C. S.
Título: | The effect of phosphorus, potassium and calcium on the growth, chemical composition, and symptoms of deficiency of White clover in a subtropical environment.
Ano de publicação: | 1960
Fonte/Imprenta: | Australian Journal of Agricultural Research, v.11, p.149-161, 1960.
Idioma: | Inglês

Conteúdo:

The effect of the rates of application of sodium phosphate, potassium, chloride, and cal-
cium carbonate on groth, chemical composition, and visual symptoms of deficiency in Trifolium repens var. Irrigation White, grown in a low humic gley soil under subtropical con-  ditions in Queenslanmd, has been investigated. The surface soil is grossly deficient in phosphorus, potassium, and calcium and consists almost entirely of sand (92 per cent.). Additions of sodium phopsphate, potassium chloride, and calcium carbonate each increa- sed the yield of clover, increased the phosphorus, potassium, and calcium contents res- pectively, and conditioned the uptake of other nutrients. Plant material for chemical analy- ses consisted of petioles and leaves (less senescent and expanding leaves) harvested at the immediate pre-flowering stage of growth. Critical percentages for phosphorus, potassi- um, and calcium under these conditions were established at 0.23, 1.1, and 1.0 per cent. respectively. Visual symptoms of phosphorus, potassium, and calcium deficiences are dis- cussed in relation to yield and nutrient content. The sum of the equivalents of potassium, calcium, and magnesium is approximately constant. The mean value of 18 analyses cove- ring all treatments was 136 m-equiv. per cent. with a range of 116-148.

Palavras-Chave: | Fertility; Growth; Meio ambiente subtropical; Subtropical environment; White clover.
Thesagro: | Composição Química; Crescimento; Fertilidade; Solo; Trevo Branco; Trifolium Repens.
Thesaurus Nal: | chemical composition; soil.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (30835-1) - ADD - SP - -- - SP1844 -  - 1844 - DIS